JPS63206963A - Information recording carrier - Google Patents

Abstract

PURPOSE:To permit exact and quick access to a desired band or block by providing regions for identifying the termination of recording regions of respective files to each of the regions and consisting said regions of the signals which can be reproduced by the same demodulation system as for the other regions. CONSTITUTION:The recording region of the M-th file (M file) is so set as to terminate within the 30th block in the N-th band (N band and in succession, said region starts from the recording region of the (M+1)th file of the N band. The two tracks at one end in an arrow direction in the respective blocks 32, i.e., at the top end in the figure, are provided as the block identifying region 33 so that the identification by each block is permitted. The immediate and exact access to the next desired block is thereby permitted and the high-speed access characteristic is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Prior Art) The present invention relates to an information record carrier, and particularly to an information record carrier with an improved recording area format.

(Prior Art) Conventionally, record carriers used for recording information using a light beam and reproducing the recorded information using a light beam have been in various shapes such as a card shape, a disk shape, and a tape shape. are known. Among them, optical information recording carriers shaped like cards (hereinafter referred to as "optical cards")
) is expected to be in great demand as a recording medium that is easy to manufacture, has good portability, and has good accessibility.

An example of the recording format of such an optical card is shown in the schematic plan view of FIG. FIG. 9 is a partially enlarged view.

In these figures, a recording area 2 is provided on an optical card 1 which is a record carrier, and this recording area 2 is located in a band 3.
are arranged in multiple rows. A large number of information tracks 4 (for example, about 4,600 per band) are arranged in these bands 3, and each track 4 has an information capacity of several tens to 100 inches (for example, 46 bits). As shown in FIG.
It consists of a bit 20, a stop bit 21, a number area 22, and a data area 23 (including a parity pit for error correction). In other words, each band is separated by a reference line (hereinafter referred to as R line) 5. Furthermore, a home position HP, which is an access reference position, is provided at a corner of the optical card 1.

It should be noted that the arrow ENT indicates the moving direction of the optical card 1 during reproduction, and the arrow C indicates the information reading scanning direction by the optical head during reproduction.

Such optical cards include, for example, types that allow for repeated recording, playback, and erasure, in which information is recorded based on the direction of magnetization, and types that allow for additional recording and playback, in which information is recorded using, for example, bit string patterns. For example, there are types that can only be reproduced, in which information is recorded based on the magnitude of the light reflection height, and they are used in forms that take advantage of their respective characteristics.

When producing a large number of cards on which the same information is recorded, a read-only optical card (hereinafter referred to as an optical ROM card) that can only be used for playback has a high SN ratio and is easy to manufacture.
is preferably used.

FIG. 10 is a schematic diagram of an apparatus for reproducing information tracks having the above recording format.

In the figure, an optical card 1 is movable back and forth in the direction of the arrow by a rotating mechanism 6, and information recorded on the optical card 1 is read and reproduced by an optical card 11. Light from a light source 7 such as an LED is focused by a lens system 8 and irradiates the optical card It. A partial image of the optical card 1 is formed on the original sensor array 10 by the imaging optical system 9. Thus, an electrical signal corresponding to the information recorded on the sensor array 10 is output from the sensor array 10. To access the target track on the optical card 1, first move the optical head 11' in the direction of the arrow C with the home position HP as a reference, and move the optical head 11' to the light eliminator, which is read by the card 11 and located on the 9R line 5. By counting the number, the band 3 to which the target track belongs is selected. Then,
As the optical card 1 moves in the direction of arrow A, the information track number area 22 is imaged on the sensor array 10.
The target track number is detected, and the information in the data area 23 of the core track is reproduced.

(Problems to be Solved by the Invention) Incidentally, it is desirable that the speed of optical card playback as described above be as fast as possible. In order to improve the playback speed, it is necessary to efficiently access the target stone band or block with the optical head.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information recording carrier having a format that allows access to a target band or block accurately and at high speed.

A further object of the present invention is to provide an information recording carrier that satisfies the above objects and can simplify the demodulation circuit used when reproducing information.

(Means for Solving the Problems) The above-mentioned object is to provide a system in which the information tracks of the present invention are arranged in a plurality of rows in a direction substantially perpendicular to the length direction of the information tracks, and bands are formed. In an information recording carrier in which a plurality of bands are arranged in parallel in the length direction of the information track and information is recorded for each of a plurality of files having different information, an end of the recording area of each of the files is recorded. This is achieved by an information recording carrier characterized in that a region for identification is provided for each region, and each region consists of a signal that can be reproduced by the same demodulation method as the other regions.

(Operation) The information recording carrier of the present invention configured as described above has an area for identifying the end of each recorded file at the end of the file, so that the information recording carrier of the present invention has an area for identifying the end of each recorded file. It is possible to detect that the playback of the fine file has ended.Therefore, after this detection, it is possible to immediately access the next target file.Also,
Since the file end area is composed of a signal that can be reproduced by the same demodulation method as other areas, the demodulation circuit used for information reproduction can be simplified.

(Examples) Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially enlarged schematic diagram showing the final block and tail track of a band of a recording format of an embodiment of an information recording carrier according to the present invention, and FIGS. , FIG.

In FIG. 1, reference numeral 4 indicates an information track consisting of information bit strings arranged in a line in the direction of arrow C.

Each information track 4 consists of 104 bits.

In this embodiment, each of the information trays 4 is as shown in partially enlarged schematic diagrams in FIGS. 2 and 3.
Preamble part of 24 bits, 36.6 bits, R line of 37.1 bits, start bit of 38.48 bits (i.e. 6 bytes), data area of 39.16 bits, 2 bytes. Error correction code 40.2 bits, track number 41
．． 4bi.

Data No. 42.1 Bi, Tora, Ri number/
It consists of dummy bits 44 of 43.2 bits, and all data except R line 37 is MFM.
It is modulated and recorded using a modulation method.

Further, in this embodiment, the information tracks 4 configured as described above are arranged in parallel in the direction of the arrow, as shown in FIG. 1, and 92 consecutive information tracks 4 form one Thirty-two blocks 32 are arranged in the direction of the arrow.Following the last block, a band end area 61 consisting of four strips is arranged to form a band 3. Further, although not shown, 32 such bands 3 are arranged in the direction of arrow C to constitute a recording area.

In this embodiment, as shown in FIG. It is assumed to end at , followed by the N-band (
It starts from the recording area of the M+13 file.

In each of the blocks 32, one end in the direction of the arrow, that is, the upper two corners in FIG. 1 is used as a block identification area 33 to enable identification of each block.

The block identification area 33, as shown in FIG. 45.8 bit, band number 46.8 bit professional,
It consists of a data area 48 of 47.16 bits.

The professional mark 45 has 8 bits as shown in Figure 4.

A total of 16 bits and 2 bytes (2 bytes) are recorded. The missing clock "'AIB" in MFM K is known from Crobby disks etc., and the data is "A1.", but the signal is not inverted between the 4th and 5th pins and the clock is lost. , which cannot exist in a signal pattern obtained by a normal MFM modulation method, can be distinguished from other format data in the optical card 1, and can be reliably identified as a professional. . In addition, the block mark 45 can be converted to another format using a demodulation circuit for modulating the information 1a recorded in the data or data tray 34.
It is possible to demodulate the pattern of
It becomes possible to simplify the demodulation circuit. Furthermore,
Track numbers 41 of tracks 33m and 33b are both 0
02", but the data area 48 of Tora, Ri 33 &
2 bytes of ti"oOa" and 2 bytes of ``FFH'' are recorded in the data area 48 of 33b.
It is now possible to distinguish between block mark tigers and ri and suplock mark tigers and ri.

The error correction code 40 in the tracks 33m and 33b can perform error correction on the data in the data area 39 in the same way as the other data trackers 34.
Professionals can be identified more reliably.

Note that error correction is performed once for each track, but for the data track 34, interception is performed and the error correction is performed at the end of the data track 32, that is, at the bottom four tracks 35 in FIG. An interlipped double-correction error correction code is recorded in the data area 39 and error correction code 40 area to improve the data error rate.

The track 33 on which professional marks are recorded requires real-time playback in order to enable high-speed access, so only one correction is performed and no interlip is performed.

In addition, there are a total of 86 data tracks and tracks in the block 32, and the data 39 in each track is a byte, so the data capacity in one block is 516 bytes, but the data is not controlled. As a convenient unit, 512 bytes/
In order to make it professional, the last 4 bytes of the last data 39 in the data track 34 are dummy data, 00. ” is recorded.

Band end area 61 consisting of four tracks shown in FIG.
Fi, as shown in Figure 3, there are a total of four different tracks 6 with the combination of two types of rotors, two types of trucks, and rear numbers.
1 &~61d.

The data area 39 has a 16-bit band end mark 6.
2, 16 bit, G band number, professional, ri number equivalent part 63
．． It consists of a 16-bit data area 64. And, band end mark 6 for 4 tigers and ri 61a to 61d.
Similar to the block mark 45 described above, there is also a single clock consisting of 8 bits and G as shown in FIG.
A total of 16 pits (2 bytes) were recorded continuously. Also, the aforementioned professional.

Like the mark, the first 16 pins of the data area 39, Tomi, Single Crop, Ri'A1. ” is recorded, so the signal processing system can be shared.Also, the area 63 corresponding to the band number 46 and the band number 47 in the professional identification area 33 has 4 tigers, and the bands 61a to 61d each have 8 bands. The maximum number “FF” that can be represented by B and G.

(=256.o)” 2 consecutive bits, 16 bits (2 bytes)
is recorded. In this way, the band end area 61 has a missing black mark similar to the block mark 45, RI@AI!
This is because the area 63 corresponding to the band number, professional number, and number of blocks is the maximum number that can actually exist from the number of bands and blocks in the recording format. , Pro, using the same signal processing system as the identification area 33, the area 63 corresponding to the band number and block number is
By reproducing , the band end area 61 is identified.

Also, in the data area 64 of the tracks 61& and 61c of the band end area 61, "OOH" is written as a 2-byte 61b.
2 bytes of @F FII# are recorded in the data area 64 of and 61d, 1 byte of "002#" is recorded in ri number 41, ri 61a and 61b, ri 61c and 61d, ``01□'' is recorded in the entry number 41. Namely, the tiger.

When the racks 61m and 61b, and the racks 61c and 61d are considered as a pair of husband and wife, they have the same configuration as the tabea 31 and tabea 31b of the professional identification area 33. The difference between the band end area 61 and the block identification area 33 is that the band number and block number equivalent part 63 is 'FFH.
”, and track number 42 is fixed to track pair 61c.
and 61d, it is "012=", so it can be distinguished from the professional identification area 33 using the same signal reproduction system as the block identification area 33, and the track number 42
By adding track pairs 61e and 61d't- with different values, the detection accuracy of the zipand end signal is improved. Furthermore, in the band end area 61, similar to the professional identification area 33, the error correction code 40 can perform single correction on the data in the data area 39, further improving the band end detection accuracy. There is.

The file end area 71 according to the present invention shown in FIG.
As shown in FIG. 4, it consists of four tracks 71 & - 71 d. In FIG. 1, this file end area 71 is provided by using the four tracks of data track 34 that follow when the data of the M file ends in the middle of the 30th block in the N band. be.

The basic configuration of the file end area 71 consisting of the four tracks is as shown in FIG. 4, and is substantially the same as the configuration of the band end area 61 shown in FIG.

The only difference is that the band number of the band is recorded in 8 bits corresponding to the band number area 46 of the professional identification area 33 shown in FIG. That is, in the file end mark 72, there are 2 "AIH" marks for 4 tracks and 8 pits shown in FIG.
A total of 16 bits (2 bytes) are recorded continuously, and the band number,
The block number corresponding section 73 contains 1'N for all four tracks.
,. '.

FF and ' are recorded respectively, 2 bytes of w"00!I' are recorded in the data areas 74 of tracks 71a and 71c, and 2 bytes of "FF,'' are recorded in the data areas 64 of tracks 71b and 7id. 71a to 7 for data in areas 72, 73, and 74 corresponding to data area 39 of a normal track.
A single correction error correction code 40 of 16 bits (8 pies) is added to each 1d bit. Also, track number 41 on tracks 71m and 71b has 00□', and track number 41 on tracks 71c and 71d has '01□'.
' is recorded.

In this way, by making the basic configuration of the file end area 71 the same as the configuration of the band end area 61, the signal processing system can be shared, so that it is possible to improve the signal processing speed and realize simple processing of the signal processing system. .

In addition, since the file end area 71 has the actual band number "N#" recorded in the band number equivalent section 73,
The band end area 61 (band number "'FFH (=2
551o)" can be clearly distinguished from "fu".

In addition, the block identification area 33 (block number "'01."
It is clearly distinguished from ~'''20H (=321o, etc.), and the end of the file can be detected reliably.

Next, an embodiment of a method for reproducing the information recording carrier will be described in detail. Here, the recording former shown in Figure 1,
An optical card is used as an information recording carrier having a charge, and a reproducing apparatus shown in FIG. 7 is used as a device for reading information from the optical card.

In the same manner as described with reference to FIGS. 5 and 6 above, the band 11 is first moved in the direction of arrow C to access the band containing the target block. Next, the optical card 1 is moved in the direction of the arrow, and the sensor array 10 of the card 11 sequentially reproduces the data in the card 4. To explain in detail the reproduction of data in this truck 4, as shown in FIG. 2, the preamble section 36 first reproduces the reference clock, and the R line 37 obtains the on-track timing. Next, the start point of the data is detected using the start bit 38, and data 39 is taken in. A single error correction code 40 is added to the data 39, and the data is reproduced while improving the error rate of the data 39 almost in real time. Data/Yarity 42 is Data 39
A total of 4 bits of odd parity (1 bit for every 2 bytes of the error correction code 40) are recorded, and the data mother IJ
The reproduction result of the tee 42 is used together with the information of the R line 37 described above to select online signals. and,
By reproducing the track number 41t together with the track number information 43, the track transition is detected together with the information on the R line 37.

In this way, the data in the track is sequentially reproduced, and from the first 2 bytes in data 39, the missing clock is reproduced.
When 'AIH'' is detected, the start of the program is recognized.Next, the band is confirmed using the band number 46, the block number is detected from the block number area 47, and the program is started. It is determined whether the number belongs to the target program or not, and if it is the target block, the information of the data area in the target program is reproduced, whereas if it is not the target program, the block is The next professional mark is detected without reproducing the information in the data area, and the same operation is performed thereafter.

In this embodiment, since the professional identification area is recorded across two tracks 33i and 33bK,
In addition to internal error correction and security checks, this also ensures professional identification. In addition, the 2-bit track numbers 41 of 12 tracks and 33 m + 33 b are the same, and the distinction is made by error-correcting the 16-pit data 48, as described above, making block identification even more reliable. becomes.

After detecting the identification area 33 of a certain block or block 32, the number and direction of blocks up to the next block or target block change, so it is necessary to move back to the source up to the desired block. By increasing the speed of feeding the card 11 and the feeding speed of the optical card 1, it is possible to shorten the access time to reach the destination.

Furthermore, since the block identification area is provided on two tracks and the band number 47 can also be obtained as information, it is more reliable when accessing tracks in the vertical direction C1 and diagonal direction beyond the band to band 3. This makes it possible to further shorten the access time.

In addition, the target program can be detected by counting the number of times the program identification area 33 is detected using a counter. By using detection of the band number in combination, it is possible to further increase the reliability of detecting the target block.

However, in this embodiment, the files are arranged serially in blocks as shown in FIG.
If the contents of these files are continuation data, access is performed in file units and the data in blocks 32 are sequentially reproduced serially. During reproduction, for example, when the light reaches the end of the (N-1) band, a missing clock "A1." is generated from the first two bytes in the data 39, similar to the block mark 45. Detected, followed by band number, professional number “FFH”,
-FF,'' is detected, and the end of the band is announced.This band end area 61&C is similar to the professional identification area 33, and the error correction code 40 is 4 Both tigers and lizards have been recorded, so
Band end detection accuracy is further improved. Also, pair 2
The track number 41 of Tora, ri 61JL, 61b, 61c and 61d is the same oo2',''01 in each pair.
□', and the distinction between tracks within each ear, that is, the detection of track transitions, is performed using 16-bit data 64, as described above.
Since the error is corrected for @00H# and @pFH, the detection accuracy is further improved.

Also, after the pair of two tracks 61a and 61b, a pair of two tracks 61c and 61d, which corresponds to data 34 in a normal block, are recorded with the track number 41't-'012# changed. Therefore, the same sequence as the signal processing system of the normal block 32 can be used, and the circuit is simplified. As a result, after reading "00H" twice in succession at the number 41, when the number changes, the identification area (pro, number identification, band end identification)
The end of is detected. Furthermore, this detection can also use information obtained from the block number area 47, improving detection accuracy.

As mentioned above, when the end of the (N-1) band is detected,
Immediately, the light is shifted to C, and then the information is sequentially reproduced from the first block of the N band in the same manner as described above. In this way, the movement of C to the light is the end of the M file.
In other words, when the file end area 71 in the 30th pro of the N band is reached, the band end area 6 described above is reached.
The end of the file is detected by the same sequence as in case 1, and then the next target file is immediately accessed.

To explain the access to this target file in more detail, first, when the miasing clock "A1." is detected from the first two bytes in the data 39 of the file end area 71, the band number "N" and the program , number K F
FH# is played and the end of the file is detected.

At this time, similarly to the band end area 61, 4 tracks 7 are
Since the error correction code 40 is recorded over the length 1&~71d, high accuracy in detecting the end of the file can be obtained. Also, a pair of 2 tracks 71m and 71b.

The track numbers of 71e and 71d are "a o o" respectively.
2#''* o 12#, the same thing is stored in each ear, and the discrimination between tracks within the pair, that is, the detection of track transition, is performed using the data in the 16-bit data area 74.
This is done based on the difference between "00" and l F p 11#, and since error correction is performed at the same time, the detection accuracy is further improved.

In addition, 2 of the pair corresponding to the professional identification area 33 mentioned above.
Since the track number 71C171dK after tracks 71m and 71b is recorded with the track number changed from 002'' to 012', similar to the detection of the band end area 61 described above, the normal professional signal processing system of RI 32 is used. The same sequence can be used, which simplifies the circuit, i.e. by said sequence track number 41 crosses V'''0
01['' and then changes to ``012'', it is detected that the identification area (pro, ri identification, band end identification, file end identification) has ended.

Note that this detection can also be performed in conjunction with collation of the file size, file end address, band number, and program number, and in this case, the end of the file can be detected with even higher accuracy.

According to the above-described embodiment, since the end of the sequence can be detected reliably, the next target file can be accessed quickly, and the random access speed can be improved.

Next, other embodiments of the present invention will be described. Figure 6 shows
FIG. 2 is a partially enlarged schematic diagram showing the recording format of the information recording carrier according to the present embodiment, and corresponds to FIG. 1 of the above-mentioned embodiment. FIG. 7 is a partially enlarged schematic diagram of the recording format shown in FIG. 6, and corresponds to FIG. 4 of the above-described embodiment.

In FIG. 6, the configurations in the information truck 4, the professional ri 32, and the band 3 are the same as in the above embodiment except for the file end area 71, so the explanation will be omitted, and the different points will be omitted. I will only explain.

In this embodiment, as shown in FIG.
Is the data of the file not recorded following the end of the data, and the next pro, immediately? ) N band, 31 pro, recorded at the beginning of ri. So, N band, 30 pro,
Dummy data ``01'' is recorded in the empty data track 34 within the file end area 71. Dummy data ``0'' is also recorded in the data track 34 after the file end area 71. Therefore, in the next (N+1) file, the band is changed and recording starts from the beginning of the (N+1) band.

In this embodiment, as shown in FIG. 7, the configuration of the file end area 71 is approximately the same as the configuration of the band end area 61 shown in FIG. The point where "FFw"k is fixed and recorded in the upper 8 bits of the 16 bits of the area 73 corresponding to the band number is recorded.

As described above, in this embodiment, as shown in FIG. 6, the beginning of each file becomes the beginning of the band, which is disadvantageous in terms of recording capacity, but facilitates file access. That is, when accessing a file, it is only necessary to search the band, and the movement of the optical card in the input direction is minimized, so that the access time can be significantly reduced. Furthermore, since the file end area 71 is located at a position corresponding to the professional identification area 33 and uses the same signal as the band end area 61, the signal processing system used to detect the band end area 61 can be used as is. This is effective in simplifying the circuit and improving processing speed, thereby improving access time. That is, as explained in the above-mentioned embodiment, when the end of a band is detected from the band end area 61, an interrupt is generated and the sequence immediately shifts to accessing the next target band. It can be used as is in the area 71.

Furthermore, the area 35 for the error correction code in the last block 32 of the file can also be used in exactly the same way as in the normal block 32 playback procedure.

Note that when the end block of the file becomes the end block of the band, the band end area 61 also serves as the file end area 71.

Further, in the above embodiment, an example is shown in which the block number is recorded in the block number area 47 with a number of bits that can identify all the blocks in band 3. If the target block is detected in combination with counting the number of times, even if the number of bits in the block number area 47 is reduced, the accuracy of detecting the target block will not be reduced. Furthermore, even if the number of bits in the block number corresponding area of the band end area 61 is reduced accordingly, the band end detection accuracy does not decrease.

Although the above embodiment shows the case where the file end area 71 consists of four tracks, the present invention is not limited to this, and when high-speed access is required, detection accuracy may be improved. For improvement, the range of the file end area 61 may be expanded by increasing the number of logs. Conversely, if an increase in data capacity is required, the number of tracks may be reduced.

Furthermore, in the above two embodiments, the file end mark 72
is data "A1." that includes a missing clock in the MFM modulation method, but is not limited to this, and in the present invention, if it is 4 p -7 (bi, tonoya turn) that does not appear in other areas, the modulation method , the position of the data and the missing clock, and the number of fathoms can be selected as appropriate.

Furthermore, in the above two embodiments, the case where a unit called a block was provided in the recording format was explained, but even in an information recording carrier where a block unit is not used,
A similar effect can be obtained by recording the entire signal indicating the end of the file according to the present invention.

Furthermore, the present invention is not only applicable to the above-mentioned optical card, but also to other record carriers having the same structure as the above-mentioned track, ribbon, and band.

(Effects of the Invention) As explained above, according to the information recording carrier of the present invention,
Since the end of a file is detected quickly and accurately, the next target file can be accessed immediately, improving the high-speed accessibility required of an information recording device.

Furthermore, according to the information recording carrier of the present invention, the demodulation circuit used when reproducing information can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the recording format of the information recording carrier according to the present invention, FIGS. 2 to 4 are partially enlarged views thereof, and FIG. 1 and #, FIG. 6 is a schematic diagram showing a recording format of an information recording carrier in another embodiment of the present invention, and FIG. 7 is a partially enlarged view of FIG. 6. 8 is a schematic diagram showing the recording format of a conventional information recording carrier, and FIG.
10 is a partially enlarged view of the recording format shown in the figure;
The figure is a schematic diagram of an optical card recording/reproducing device. 3...Band, 4...Information Tiger, Ri, 32...Block, 33...Professional! Identification area, 61...Band end area, 62...Band end mark, 71...
-File end fi[, 72...File end mark. Fig. 1 N-f'NN-N Fig. 6 N-INN+1

Claims (3)

[Claims] (1) Information tracks formed by arranging information one-dimensionally are arranged in a plurality of rows in a direction substantially perpendicular to the length direction of the information tracks to form bands, and the bands extend in the length direction of the information tracks. In an information recording carrier in which information is recorded for each of a plurality of files arranged in parallel and having different information, an area for identifying the end of the recording area of each of the files is provided for each area, and the area is An information recording carrier characterized in that it consists of a signal that can be reproduced by the same demodulation method as in other areas. (2) The information recording carrier according to claim 1, wherein the signal recorded in the area consists of a signal pattern that does not appear in the other areas. (3) The signal recorded in the area is common to the signal recorded in the area for identifying the end of the band and consists of a signal pattern that does not appear in other areas except for the band end identification area. An information record carrier according to claim 1, characterized in that: